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WO2017188758A1 - Procédé et appareil d'interruption/reprise de signalisation nas dans un système de communication sans fil - Google Patents

Procédé et appareil d'interruption/reprise de signalisation nas dans un système de communication sans fil Download PDF

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Publication number
WO2017188758A1
WO2017188758A1 PCT/KR2017/004504 KR2017004504W WO2017188758A1 WO 2017188758 A1 WO2017188758 A1 WO 2017188758A1 KR 2017004504 W KR2017004504 W KR 2017004504W WO 2017188758 A1 WO2017188758 A1 WO 2017188758A1
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Prior art keywords
message
layer
nas
rrc
indication
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English (en)
Korean (ko)
Inventor
김태훈
한상욱
김재현
이선영
이재욱
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LG Electronics Inc
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LG Electronics Inc
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Priority to US16/097,195 priority Critical patent/US20190141776A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for supporting the non-access stratum (NAS) signaling suspend / resume (resume).
  • NAS non-access stratum
  • Mobile communication systems have been developed to provide voice services while ensuring user activity.
  • the mobile communication system has expanded not only voice but also data service.As a result of the explosive increase in traffic, a shortage of resources and users are demanding higher speed services, a more advanced mobile communication system is required. have.
  • An object of the present invention when resuming the reserved NAS signaling, the AS (Access Stratum) layer of the terminal to transmit the data volume information in the AS layer in the NAS layer so that the data volume indicator can be transmitted in the third message (Msg3) Suggest a method.
  • AS Access Stratum
  • An aspect of the present invention provides a method for a user equipment (UE) in a wireless communication system to suspend / resume a non-access stratum (NAS) signaling connection.
  • UE user equipment
  • NAS non-access stratum
  • the UE sends an advanced packet system mobility management (EMM) with a suspension indication.
  • RRC Radio Resource Control
  • EMM advanced packet system mobility management
  • Evolved Packet System (EPS) Mobility Management (IDLE) mode to enter the (IDLE) mode and when the procedure using the first NAS message triggered, requesting the RRC layer of the UE to resume the RRC connection (resume) And the request includes an RRC establishment cause and a call type, and when the UE is in narrow band (NB) -S1 mode, the request is the data volume of the original NAS message. Information (data volume information) may be further included.
  • EPS Evolved Packet System
  • IDLE Evolved Packet System
  • Another aspect of the present invention relates to a user equipment (UE) for suspend / resume a non-access stratum (NAS) signaling connection in a wireless communication system.
  • a communication module for transmitting and receiving signals and a processor for controlling the communication module, wherein the processor reserves an RRC connection from a Radio Resource Control (RRC) layer of a NAS layer of the UE.
  • RRC Radio Resource Control
  • the UE Upon receipt of an indication that the message has been received, the UE enters an Evolved Packet System (EPS) Mobility Management (EMM) -IDLE mode with a suspend indication and uses an initial NAS message.
  • EPS Evolved Packet System
  • EMM Mobility Management
  • the NAS layer of the UE is configured to request the RRC layer of the UE to resume the RRC connection, the request is RRC establishment and call type (cal) l type), and when the UE is in a narrow band (NB) -S1 mode, the request may further include data volume information of the first NAS message.
  • the first NAS message may include a first message for transmitting data to a control plane.
  • the data volume information may indicate the size of the data or may indicate the size of the first NAS message.
  • the data volume information includes a size of an ESM message container including an EPS Session Management (ESM) message in the first message or an size of an SMS message container including a Short Message Service (SMS) message. Can be directed.
  • ESM EPS Session Management
  • SMS Short Message Service
  • the UE when the UE is in EMM-IDLE mode with the suspend indication, upon receiving an indication from the RRC layer that an RRC connection has been resumed, the UE may enter an EMM-CONNECTED mode. have.
  • the first NAS message when the first NAS message is a SERVICE REQUEST message, the first NAS message may not be delivered to the RRC layer.
  • the first NAS message when the first NAS message is not a SERVICE REQUEST message, the first NAS message may be delivered to the RRC layer.
  • the UE when the UE is in EMM-IDLE mode with the suspend indication, if the UE receives an indication that the resumption of RRC connection has fallen back from the RRC layer, the UE indicates that the suspend indication is EMM-IDLE mode can be entered.
  • said original NAS message may be delivered to said RRC layer.
  • the UE may enter an EMM-IDLE mode with a suspend indication.
  • the UE may enter an EMM-IDLE mode without a suspend indication.
  • the transmission latency of the first NAS message of the terminal can be reduced.
  • FIG. 1 is a view briefly illustrating an EPS (Evolved Packet System) to which the present invention can be applied.
  • EPS Evolved Packet System
  • E-UTRAN evolved universal terrestrial radio access network
  • FIG. 3 illustrates the structure of an E-UTRAN and an EPC in a wireless communication system to which the present invention can be applied.
  • FIG. 4 shows a structure of a radio interface protocol between a terminal and an E-UTRAN in a wireless communication system to which the present invention can be applied.
  • FIG. 5 is a diagram exemplarily illustrating a structure of a physical channel in a wireless communication system to which the present invention can be applied.
  • FIG. 6 is a diagram for explaining a contention based random access procedure in a wireless communication system to which the present invention can be applied.
  • FIG. 7 illustrates a procedure for small data transmission in a wireless communication system to which the present invention can be applied.
  • FIG. 8 illustrates a procedure for data volume reporting and small data transmission in a wireless communication system to which the present invention can be applied.
  • FIG. 9 illustrates a connection suspend procedure initiated by a base station in a wireless communication system to which the present invention can be applied.
  • FIG. 10 illustrates a connection resume procedure initiated by a UE in a wireless communication system to which the present invention can be applied.
  • FIG. 11 illustrates an RRC connection resumption procedure in a wireless communication system to which the present invention can be applied.
  • FIG. 12 is a diagram illustrating a problem of a connection resumption procedure in a wireless communication system to which the present invention can be applied.
  • FIG. 13 is a diagram illustrating a method in which a UE performs NAS signaling reservation / resume according to an embodiment of the present invention.
  • FIG. 14 illustrates a block diagram of a communication device according to an embodiment of the present invention.
  • FIG. 15 illustrates a block diagram of a communication device according to an embodiment of the present invention.
  • a base station has a meaning as a terminal node of a network that directly communicates with a terminal.
  • the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an evolved-NodeB (eNB), a base transceiver system (BTS), an access point (AP), and the like. .
  • a 'terminal' may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.
  • UE user equipment
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS Advanced Mobile Station
  • WT Wireless Terminal
  • MTC Machine-Type Communication
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • downlink means communication from a base station to a terminal
  • uplink means communication from a terminal to a base station.
  • a transmitter may be part of a base station, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal and a receiver may be part of a base station.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA).
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A (advanced) is the evolution of 3GPP LTE.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP and 3GPP2. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
  • UMTS Universal Mobile Telecommunications System
  • GSM Global System for Mobile Communication
  • Evolved Packet System A network system consisting of an Evolved Packet Core (EPC), which is a packet switched core network based on Internet Protocol (IP), and an access network such as LTE and UTRAN.
  • EPC Evolved Packet Core
  • IP Internet Protocol
  • UMTS is an evolutionary network.
  • NodeB base station of UMTS network. It is installed outdoors and its coverage is macro cell size.
  • eNodeB base station of EPS network. It is installed outdoors and its coverage is macro cell size.
  • a terminal may be referred to in terms of terminal, mobile equipment (ME), mobile station (MS), and the like.
  • the terminal may be a portable device such as a laptop, a mobile phone, a personal digital assistant (PDA), a smartphone, a multimedia device, or the like, or may be a non-portable device such as a personal computer (PC) or a vehicle-mounted device.
  • the term "terminal” or “terminal” in the MTC related content may refer to an MTC terminal.
  • IMS IP Multimedia Subsystem
  • IMSI International Mobile Subscriber Identity
  • Machine Type Communication Communication performed by a machine without human intervention. It may also be referred to as M2M (Machine to Machine) communication.
  • MTC terminal MTC UE or MTC device or MTC device: a terminal (eg, vending machine, etc.) having a function of communicating via a mobile communication network (for example, communicating with an MTC server via a PLMN) and performing an MTC function; Meter reading, etc.).
  • MTC UE or MTC device or MTC device a terminal having a function of communicating via a mobile communication network (for example, communicating with an MTC server via a PLMN) and performing an MTC function; Meter reading, etc.).
  • MTC server A server on a network that manages an MTC terminal. It may exist inside or outside the mobile communication network. It may have an interface that an MTC user can access. In addition, the MTC server may provide MTC related services to other servers (Services Capability Server (SCS)), or the MTC server may be an MTC application server.
  • SCS Services Capability Server
  • MTC mobile broadband
  • services e.g., remote meter reading, volume movement tracking, weather sensors, etc.
  • (MTC) application server a server on a network where (MTC) applications run
  • MTC feature A function of a network to support an MTC application.
  • MTC monitoring is a feature for preparing for loss of equipment in an MTC application such as a remote meter reading
  • low mobility is a feature for an MTC application for an MTC terminal such as a vending machine.
  • the MTC user uses a service provided by the MTC server.
  • MTC subscriber An entity having a connection relationship with a network operator and providing a service to one or more MTC terminals.
  • MTC group A group of MTC terminals that share at least one MTC feature and belongs to an MTC subscriber.
  • SCS Services Capability Server
  • MTC-IWF MTC InterWorking Function
  • HPLMN Home PLMN
  • SCS provides the capability for use by one or more MTC applications.
  • External Identifier An identifier used by an external entity (e.g., an SCS or application server) of a 3GPP network to point to (or identify) an MTC terminal (or a subscriber to which the MTC terminal belongs). Globally unique.
  • the external identifier is composed of a domain identifier and a local identifier as follows.
  • Domain Identifier An identifier for identifying a domain in a control term of a mobile communication network operator.
  • One provider may use a domain identifier for each service to provide access to different services.
  • Local Identifier An identifier used to infer or obtain an International Mobile Subscriber Identity (IMSI). Local identifiers must be unique within the application domain and are managed by the mobile telecommunications network operator.
  • IMSI International Mobile Subscriber Identity
  • RAN Radio Access Network: a unit including a Node B, a Radio Network Controller (RNC), and an eNodeB controlling the Node B in a 3GPP network. It exists at the terminal end and provides connection to the core network.
  • RNC Radio Network Controller
  • HLR Home Location Register
  • HSS Home Subscriber Server
  • RANAP RAN Application Part: between the RAN and the node in charge of controlling the core network (ie, Mobility Management Entity (MME) / Serving General Packet Radio Service (GPRS) Supporting Node) / MSC (Mobile Switching Center) Interface.
  • MME Mobility Management Entity
  • GPRS General Packet Radio Service
  • MSC Mobile Switching Center
  • PLMN Public Land Mobile Network
  • SEF Service Capability Exposure Function
  • FIG. 1 is a diagram briefly illustrating an EPS (Evolved Packet System) to which the present invention may be applied.
  • EPS Evolved Packet System
  • the network structure diagram of FIG. 1 briefly reconstructs a structure of an EPS (Evolved Packet System) including an Evolved Packet Core (EPC).
  • EPS Evolved Packet System
  • EPC Evolved Packet Core
  • EPC Evolved Packet Core
  • SAE System Architecture Evolution
  • SAE is a research project to determine network structure supporting mobility between various kinds of networks.
  • SAE aims to provide an optimized packet-based system, for example, supporting various radio access technologies on an IP basis and providing improved data transfer capability.
  • the EPC is a core network of an IP mobile communication system for a 3GPP LTE system and may support packet-based real-time and non-real-time services.
  • a conventional mobile communication system i.e., a second generation or third generation mobile communication system
  • the core network is divided into two distinct sub-domains of circuit-switched (CS) for voice and packet-switched (PS) for data.
  • CS circuit-switched
  • PS packet-switched
  • the function has been implemented.
  • the sub-domains of CS and PS have been unified into one IP domain.
  • the EPC may include various components, and in FIG. 1, some of them correspond to a Serving Gateway (SGW) (or S-GW), PDN GW (Packet Data Network Gateway) (or PGW or P-GW), A mobility management entity (MME), a Serving General Packet Radio Service (GPRS) Supporting Node (SGSN), and an enhanced Packet Data Gateway (ePDG) are shown.
  • SGW Serving Gateway
  • PDN GW Packet Data Network Gateway
  • MME mobility management entity
  • GPRS General Packet Radio Service
  • SGSN Serving General Packet Radio Service
  • ePDG enhanced Packet Data Gateway
  • the SGW acts as a boundary point between the radio access network (RAN) and the core network, and is an element that functions to maintain a data path between the eNodeB and the PDN GW.
  • the SGW serves as a local mobility anchor point. That is, packets may be routed through the SGW for mobility in the E-UTRAN (Universal Mobile Telecommunications System (Evolved-UMTS) Terrestrial Radio Access Network defined in 3GPP Release-8 or later).
  • E-UTRAN Universal Mobile Telecommunications System (Evolved-UMTS) Terrestrial Radio Access Network defined in 3GPP Release-8 or later.
  • SGW also provides mobility with other 3GPP networks (RANs defined before 3GPP Release-8, such as UTRAN or GERAN (Global System for Mobile Communication (GSM) / Enhanced Data Rates for Global Evolution (EDGE) Radio Access Network). It can also function as an anchor point.
  • RANs defined before 3GPP Release-8 such as UTRAN or GERAN (Global System for Mobile Communication (GSM) / Enhanced Data Rates for Global Evolution (EDGE) Radio Access Network). It can also function as an anchor point.
  • GSM Global System for Mobile Communication
  • EDGE Enhanced Data Rates for Global Evolution
  • the PDN GW corresponds to the termination point of the data interface towards the packet data network.
  • the PDN GW may support policy enforcement features, packet filtering, charging support, and the like.
  • untrusted networks such as 3GPP networks and non-3GPP networks (e.g., Interworking Wireless Local Area Networks (I-WLANs), trusted divisions such as Code Division Multiple Access (CDMA) networks or Wimax). It can serve as an anchor point for mobility management with the network.
  • I-WLANs Interworking Wireless Local Area Networks
  • CDMA Code Division Multiple Access
  • FIG. 1 shows that the SGW and the PDN GW are configured as separate gateways, two gateways may be implemented according to a single gateway configuration option.
  • the MME is an element that performs signaling and control functions for supporting access to a network connection, allocation of network resources, tracking, paging, roaming, handover, and the like.
  • the MME controls the control plane functions related to subscriber and session management.
  • the MME manages a number of eNodeBs and performs signaling for the selection of a conventional gateway for handover to other 2G / 3G networks.
  • the MME also performs functions such as security procedures, terminal-to-network session handling, and idle terminal location management.
  • SGSN handles all packet data, such as user's mobility management and authentication to other 3GPP networks (eg GPRS networks).
  • 3GPP networks eg GPRS networks.
  • the ePDG acts as a secure node for untrusted non-3GPP networks (eg, I-WLAN, WiFi hotspots, etc.).
  • untrusted non-3GPP networks eg, I-WLAN, WiFi hotspots, etc.
  • a terminal having IP capability includes an IP service network provided by an operator (ie, an operator) via various elements in the EPC, based on 3GPP access as well as non-3GPP access.
  • an operator ie, an operator
  • 3GPP access based on 3GPP access as well as non-3GPP access.
  • IMS IMS
  • FIG. 1 illustrates various reference points (eg, S1-U, S1-MME, etc.).
  • a conceptual link defining two functions existing in different functional entities of E-UTRAN and EPC is defined as a reference point.
  • Table 1 below summarizes the reference points shown in FIG. 1.
  • various reference points may exist according to the network structure.
  • S2a and S2b correspond to non-3GPP interfaces.
  • S2a is a reference point that provides the user plane with relevant control and mobility resources between trusted non-3GPP access and PDN GW.
  • S2b is a reference point that provides the user plane with relevant control and mobility support between the ePDG and the PDN GW.
  • E-UTRAN evolved universal terrestrial radio access network
  • the E-UTRAN system is an evolution from the existing UTRAN system and may be, for example, a 3GPP LTE / LTE-A system.
  • Communication networks are widely deployed to provide various communication services, such as voice (eg, Voice over Internet Protocol (VoIP)) over IMS and packet data.
  • voice eg, Voice over Internet Protocol (VoIP)
  • VoIP Voice over Internet Protocol
  • an E-UMTS network includes an E-UTRAN, an EPC, and one or more UEs.
  • the E-UTRAN consists of eNBs providing a control plane and a user plane protocol to the UE, and the eNBs are connected through an X2 interface.
  • X2 user plane interface (X2-U) is defined between eNBs.
  • the X2-U interface provides non guaranteed delivery of user plane packet data units (PDUs).
  • An X2 control plane interface (X2-CP) is defined between two neighboring eNBs.
  • X2-CP performs functions such as context transfer between eNBs, control of user plane tunnel between source eNB and target eNB, delivery of handover related messages, and uplink load management.
  • the eNB is connected to the terminal through a wireless interface and is connected to an evolved packet core (EPC) through the S1 interface.
  • EPC evolved packet core
  • the S1 user plane interface (S1-U) is defined between the eNB and the serving gateway (S-GW).
  • the S1 control plane interface (S1-MME) is defined between the eNB and the mobility management entity (MME).
  • the S1 interface performs an evolved packet system (EPS) bearer service management function, a non-access stratum (NAS) signaling transport function, network sharing, and MME load balancing function.
  • EPS evolved packet system
  • NAS non-access stratum
  • the S1 interface supports a many-to-many-relation between eNB and MME / S-GW.
  • MME provides NAS signaling security, access stratum (AS) security control, inter-CN inter-CN signaling to support mobility between 3GPP access networks, and performing and controlling paging retransmission.
  • EWS Earthquake and Tsunami Warning System
  • CMAS Commercial Mobile Alert System
  • FIG. 3 illustrates the structure of an E-UTRAN and an EPC in a wireless communication system to which the present invention can be applied.
  • an eNB may select a gateway (eg, MME), route to the gateway during radio resource control (RRC) activation, scheduling of a broadcast channel (BCH), and the like. Dynamic resource allocation to the UE in transmission, uplink and downlink, and may perform the function of mobility control connection in the LTE_ACTIVE state.
  • the gateway is responsible for paging initiation, LTE_IDLE state management, ciphering of the user plane, System Architecture Evolution (SAE) bearer control, and NAS signaling encryption. It can perform the functions of ciphering and integrity protection.
  • FIG. 4 shows a structure of a radio interface protocol between a terminal and an E-UTRAN in a wireless communication system to which the present invention can be applied.
  • FIG. 4 (a) shows the radio protocol structure for the control plane and FIG. 4 (b) shows the radio protocol structure for the user plane.
  • the layers of the air interface protocol between the terminal and the E-UTRAN are based on the lower three layers of the open system interconnection (OSI) standard model known in the art of communication systems. It may be divided into a first layer L1, a second layer L2, and a third layer L3.
  • the air interface protocol between the UE and the E-UTRAN consists of a physical layer, a data link layer, and a network layer horizontally, and vertically stacks a protocol stack for transmitting data information. (protocol stack) It is divided into a user plane and a control plane, which is a protocol stack for transmitting control signals.
  • the control plane refers to a path through which control messages used by the terminal and the network to manage a call are transmitted.
  • the user plane refers to a path through which data generated at an application layer, for example, voice data or Internet packet data, is transmitted.
  • an application layer for example, voice data or Internet packet data
  • a physical layer which is a first layer (L1), provides an information transfer service to a higher layer by using a physical channel.
  • the physical layer is connected to a medium access control (MAC) layer located at a higher level through a transport channel, and data is transmitted between the MAC layer and the physical layer through the transport channel.
  • Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.
  • data is transmitted between different physical layers through a physical channel between a physical layer of a transmitter and a physical layer of a receiver.
  • the physical layer is modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
  • OFDM orthogonal frequency division multiplexing
  • a physical downlink control channel is a resource allocation of a paging channel (PCH) and a downlink shared channel (DL-SCH) and uplink shared channel (UL-SCH) to the UE. : informs hybrid automatic repeat request (HARQ) information associated with an uplink shared channel (HARQ).
  • the PDCCH may carry an UL grant that informs the UE of resource allocation of uplink transmission.
  • the physical control format indicator channel (PCFICH) informs the UE of the number of OFDM symbols used for PDCCHs and is transmitted every subframe.
  • a physical HARQ indicator channel (PHICH) carries a HARQ acknowledgment (ACK) / non-acknowledge (NACK) signal in response to uplink transmission.
  • the physical uplink control channel (PUCCH) carries uplink control information such as HARQ ACK / NACK, downlink request and channel quality indicator (CQI) for downlink transmission.
  • a physical uplink shared channel (PUSCH) carries a UL-SCH.
  • the MAC layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
  • RLC radio link control
  • the MAC layer multiplexes / demultiplexes into a transport block provided as a physical channel on a transport channel of a MAC service data unit (SDU) belonging to the logical channel and mapping between the logical channel and the transport channel.
  • SDU MAC service data unit
  • the RLC layer of the second layer supports reliable data transmission. Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs.
  • the RLC layer In order to guarantee the various quality of service (QoS) required by the radio bearer (RB), the RLC layer has a transparent mode (TM), an unacknowledged mode (UM) and an acknowledgment mode (AM). There are three modes of operation: acknowledge mode.
  • AM RLC provides error correction through an automatic repeat request (ARQ). Meanwhile, when the MAC layer performs an RLC function, the RLC layer may be included as a functional block of the MAC layer.
  • the packet data convergence protocol (PDCP) layer of the second layer (L2) performs user data transmission, header compression, and ciphering functions in the user plane.
  • Header compression is relatively large and large in order to allow efficient transmission of Internet protocol (IP) packets, such as IPv4 (internet protocol version 4) or IPv6 (internet protocol version 6), over a small bandwidth wireless interface. It means the function to reduce the IP packet header size that contains unnecessary control information.
  • IP Internet protocol
  • IPv4 Internet protocol version 4
  • IPv6 Internet protocol version 6
  • a radio resource control (RRC) layer located at the lowest part of the third layer L3 is defined only in the control plane.
  • the RRC layer serves to control radio resources between the terminal and the network.
  • the UE and the network exchange RRC messages with each other through the RRC layer.
  • the RRC layer controls the logical channel, transport channel and physical channel with respect to configuration, re-configuration and release of radio bearers.
  • the radio bearer means a logical path provided by the second layer (L2) for data transmission between the terminal and the network.
  • Establishing a radio bearer means defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method.
  • the radio bearer may be further divided into two signaling radio bearers (SRBs) and data radio bearers (DRBs).
  • SRB is used as a path for transmitting RRC messages in the control plane
  • DRB is used as a path for transmitting user data in the user plane.
  • a non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
  • NAS non-access stratum
  • One cell constituting the base station is set to one of the bandwidth, such as 1.25, 2.5, 5, 10, 20Mhz to provide a downlink or uplink transmission service to multiple terminals.
  • Different cells may be configured to provide different bandwidths.
  • a downlink transport channel for transmitting data from a network to a terminal includes a broadcast channel (BCH) for transmitting system information, a PCH for transmitting a paging message, and a DL-SCH for transmitting user traffic or control messages.
  • BCH broadcast channel
  • PCH for transmitting a paging message
  • DL-SCH for transmitting user traffic or control messages.
  • Traffic or control messages of the downlink multicast or broadcast service may be transmitted through the DL-SCH or may be transmitted through a separate downlink multicast channel (MCH).
  • an uplink transport channel for transmitting data from a terminal to a network includes a random access channel (RACH) for transmitting an initial control message, and an UL-SCH (uplink shared) for transmitting user traffic or a control message. channel).
  • RACH random access channel
  • UL-SCH uplink shared
  • the logical channel is on top of the transport channel and is mapped to the transport channel.
  • the logical channel may be divided into a control channel for transmitting control region information and a traffic channel for delivering user region information.
  • the control channel includes a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a dedicated control channel (DCCH), multicast And a control channel (MCCH: multicast control channel).
  • Traffic channels include a dedicated traffic channel (DTCH) and a multicast traffic channel (MTCH).
  • PCCH is a downlink channel that carries paging information and is used when the network does not know the cell to which the UE belongs.
  • CCCH is used by a UE that does not have an RRC connection with the network.
  • the DCCH is a point-to-point bi-directional channel used by a terminal having an RRC connection for transferring dedicated control information between the UE and the network.
  • DTCH is a point-to-point channel dedicated to one terminal for transmitting user information that may exist in uplink and downlink.
  • MTCH is a point-to-multipoint downlink channel for carrying traffic data from the network to the UE.
  • the DCCH may be mapped to the UL-SCH
  • the DTCH may be mapped to the UL-SCH
  • the CCCH may be mapped to the UL-SCH.
  • the BCCH may be mapped with the BCH or DL-SCH
  • the PCCH may be mapped with the PCH
  • the DCCH may be mapped with the DL-SCH.
  • the DTCH may be mapped with the DL-SCH
  • the MCCH may be mapped with the MCH
  • the MTCH may be mapped with the MCH.
  • FIG. 5 is a diagram exemplarily illustrating a structure of a physical channel in a wireless communication system to which the present invention can be applied.
  • a physical channel transmits signaling and data through a radio resource including one or more subcarriers in a frequency domain and one or more symbols in a time domain.
  • One subframe having a length of 1.0 ms is composed of a plurality of symbols.
  • the specific symbol (s) of the subframe eg, the first symbol of the subframe
  • the PDCCH carries information about dynamically allocated resources (eg, a resource block, a modulation and coding scheme (MCS), etc.).
  • MCS modulation and coding scheme
  • the UE performs an RRC connection re-establishment procedure. Cases are performed.
  • a contention-based random access procedure in which the UE randomly selects and uses one preamble within a specific set And a non-contention based random access procedure using a random access preamble allocated by a base station only to a specific terminal.
  • FIG. 6 is a diagram for explaining a contention based random access procedure in a wireless communication system to which the present invention can be applied.
  • the UE randomly selects one random access preamble (RACH preamble) from a set of random access preambles indicated through system information or a handover command, and A physical RACH (PRACH) resource capable of transmitting a random access preamble is selected and transmitted.
  • RACH preamble random access preamble
  • PRACH physical RACH
  • the base station receiving the random access preamble from the terminal decodes the preamble and obtains an RA-RNTI.
  • the RA-RNTI associated with the PRACH in which the random access preamble is transmitted is determined according to the time-frequency resource of the random access preamble transmitted by the corresponding UE.
  • the base station transmits a random access response addressed to the RA-RNTI obtained through the preamble on the first message to the terminal.
  • the random access response includes a random access preamble identifier (RA preamble index / identifier), an uplink grant (UL grant) indicating an uplink radio resource, a temporary cell identifier (TC-RNTI), and a time synchronization value ( TAC: time alignment commands) may be included.
  • the TAC is information indicating a time synchronization value that the base station sends to the terminal to maintain uplink time alignment.
  • the terminal updates the uplink transmission timing by using the time synchronization value. When the terminal updates the time synchronization, a time alignment timer is started or restarted.
  • the UL grant includes an uplink resource allocation and a transmit power command (TPC) used for transmission of a scheduling message (third message), which will be described later. TPC is used to determine the transmit power for the scheduled PUSCH.
  • TPC transmit power command
  • the base station After the UE transmits the random access preamble, the base station attempts to receive its random access response within the random access response window indicated by the system information or the handover command, and PRACH
  • the PDCCH masked by the RA-RNTI corresponding to the PDCCH is detected, and the PDSCH indicated by the detected PDCCH is received.
  • the random access response information may be transmitted in the form of a MAC packet data unit (MAC PDU), and the MAC PDU may be transmitted through a PDSCH.
  • MAC PDU MAC packet data unit
  • the monitoring stops the random access response.
  • the random access response message is not received until the random access response window ends, or if a valid random access response having the same random access preamble identifier as the random access preamble transmitted to the base station is not received, the random access response is received. Is considered to have failed, and then the UE may perform preamble retransmission.
  • the terminal When the terminal receives a valid random access response to the terminal, it processes each of the information included in the random access response. That is, the terminal applies the TAC, and stores the TC-RNTI. In addition, by using the UL grant, the data stored in the buffer of the terminal or newly generated data is transmitted to the base station.
  • an RRC connection request generated in the RRC layer and delivered through the CCCH may be included in the third message and transmitted.
  • the RRC layer is generated in the RRC layer and CCCH.
  • the RRC connection reestablishment request delivered through the RRC connection reestablishment request may be included in the third message and transmitted. It may also include a NAS connection request message.
  • the third message should include the identifier of the terminal.
  • the first method if the UE has a valid cell identifier (C-RNTI) allocated in the corresponding cell before the random access procedure, the UE transmits its cell identifier through an uplink transmission signal corresponding to the UL grant. do.
  • the UE may include its own unique identifier (eg, SAE temporary mobile subscriber identity (S-TMSI) or random number). send.
  • S-TMSI temporary mobile subscriber identity
  • the unique identifier is longer than the C-RNTI.
  • the UE If the UE transmits data corresponding to the UL grant, it starts a timer for contention resolution (contention resolution timer).
  • the base station When the base station receives the C-RNTI of the terminal through the third message from the terminal, the base station transmits a fourth message to the terminal using the received C-RNTI.
  • the unique identifier ie, S-TMSI or random number
  • the fourth message is transmitted using the TC-RNTI allocated to the terminal in the random access response.
  • the fourth message may include an RRC connection setup message.
  • the terminal After transmitting the data including its identifier through the UL grant included in the random access response, the terminal waits for an instruction of the base station to resolve the collision. That is, it attempts to receive a PDCCH to receive a specific message.
  • the third message transmitted in response to the UL grant is its C-RNTI
  • the identifier is a unique identifier (that is, In the case of S-TMSI or a random number, it attempts to receive the PDCCH using the TC-RNTI included in the random access response.
  • the terminal determines that the random access procedure has been normally performed, and terminates the random access procedure.
  • the terminal determines that the random access procedure has been normally performed, and terminates the random access procedure.
  • the terminal determines that the random access procedure is normally performed, and terminates the random access procedure.
  • the terminal acquires the C-RNTI through the fourth message, and then the terminal and the network transmit and receive a terminal-specific message using the C-RNTI.
  • the random access procedure is terminated by only transmitting the first message and transmitting the second message.
  • the terminal before the terminal transmits the random access preamble to the base station as the first message, the terminal is allocated a random access preamble from the base station, and transmits the allocated random access preamble to the base station as a first message, and sends a random access response from the base station.
  • the random access procedure is terminated by receiving.
  • Dedicated bearer An EPS bearer associated with uplink packet filter (s) in the UE and downlink packet filter (s) in the P-GW. Here filter (s) only matches a particular packet.
  • Default bearer EPS bearer established with every new PDN connection. The context of the default bearer is maintained for the lifetime of the PDN connection.
  • EMM-NULL EPS Mobility Management
  • EMM-DEREGISTERED state In the EMM-DEREGISTERED state, no EMM context is established and the UE location is unknown to the MME. Thus, the UE is unreachable by the MME. In order to establish the EMM context, the UE must start an attach or combined attach procedure.
  • EMM-REGISTERED state In the EMM-REGISTERED state, an EMM context in the UE is established and a default EPS bearer context is activated. When the UE is in EMM-IDLE mode, the UE location is known to the MME with the accuracy of the list of TAs containing the specific number of the TA. The UE may initiate transmission and reception of user data and signaling information and may respond to paging. In addition, a TAU or combined TAU procedure is performed.
  • EMM-CONNECTED mode When a NAS signaling connection is established between the UE and the network, the UE is in EMM-CONNECTED mode.
  • EMM-CONNECTED may be referred to as the term of the ECM-CONNECTED state.
  • EMM-IDLE mode NAS signaling connection does not exist between the UE and the network (i.e. EMM-IDLE mode without reservation indication) or RRC connection suspend is indicated by the lower layer.
  • EMM-IDLE mode ie, EMM-IDLE mode with a reservation indication.
  • the term EMM-IDLE may also be referred to as the term of the ECM-IDLE state.
  • EMM context If the attach procedure is successfully completed, the EMM context is established in the UE and the MME.
  • Control plane CIoT EPS optimization Signaling optimization to enable efficient transport of user data (IP, non-IP or SMS) via the control plane via MME.
  • IP user data
  • non-IP or SMS control plane via MME.
  • header compression of IP data may be included.
  • User Plane CIoT EPS optimization Signaling optimization that enables efficient delivery of user data (IP or non-IP) through the user plane
  • EPS service (s) service (s) provided by the PS domain.
  • NAS signaling connection Peer-to-peer S1 mode connection between UE and MME.
  • the NAS signaling connection is composed of a concatenation of an RRC connection through the LTE-Uu interface and an S1AP connection through the S1 interface.
  • UEs using EPS services with control plane CIoT EPS optimization UEs attached for EPS services with control plane CIOT EPS optimization accepted by the network
  • Non-Access Stratum A functional layer for transmitting and receiving signaling and traffic messages between a terminal and a core network in a UMTS and EPS protocol stack. The main function is to support the mobility of the terminal and to support the session management procedure for establishing and maintaining an IP connection between the terminal and the PDN GW.
  • AS Access Stratum
  • AS Access Stratum
  • an RRC layer, a PDCP layer, an RLC layer, a MAC layer, and a PHY layer may be collectively referred to, or any one of these layers may be referred to as an AS layer.
  • the PDCP layer, the RLC layer, the MAC layer, and the PHY layer may be collectively referred to, or any one of these layers may be referred to as an AS layer.
  • S1 mode A mode applied to a system having a functional separation according to the use of the S1 interface between the radio access network and the core network.
  • S1 mode includes WB-S1 mode and NB-S1 mode.
  • NB-S1 mode A serving radio access network of a UE allows access to network services (via E-UTRA) by narrowband (NB) -Internet of Things (NB). When providing, the UE applies this mode.
  • WB-S1 mode If the system is operating in S1 mode but not in NB-S1 mode, this mode is applied.
  • 5G Access Network 5G Radio Access Network
  • 5G-RAN 5G Radio Access Network
  • 5G-AN non-5G Access Network
  • 5G Core Network An access network consisting of).
  • 5G Core Network A core network connected to a 5G access network.
  • 5G Radio Access Network A radio access network having a common feature connected to 5GC and supporting one or more of the following options:
  • 5G System 5G System: 3GPP system consisting of 5G Access Network (AN), 5G Core Network and UE
  • DPR Data Volume and Power Headroom Report
  • DPR is performed using a DPR MAC control element, which is transmitted in a third message (Msg3) with a common control channel (CCCH) service data unit (SDU).
  • Msg3 common control channel (CCCH) service data unit
  • Msg 3 is a message transmitted on an UL-SCH including a Cell Radio Network Temporary Identifier (C-RNTI) MAC Control Element (CE) or CCCH SDU (see FIG. 6 above).
  • C-RNTI Cell Radio Network Temporary Identifier
  • CE MAC Control Element
  • CCCH SDU CCCH SDU
  • the DPR MAC CE is identified by the MAC packet data unit (PDU) subheader used for CCCH MAC SDU.
  • PDU packet data unit
  • the DPR MAC CE does not add any additional subheaders and is always located before the CCCH MAC SDU.
  • the DPR MAC CE has a fixed size and consists of a single octet. From the most significant bit (MSB) to least significant bit (LSB) of the DPR MAC CE, the first two bits are reserved bits and the next two bits are power headroom (PH). Headroom) field, and the next 4 bits are a Data Volume (DV) field.
  • MSB most significant bit
  • LSB least significant bit
  • PH power headroom
  • DV Data Volume
  • the DV field is the total amount of data that is not associated with a logical channel after the data available on all logical channel (s) and all MAC PDU (s) for the TTI have been created. Identifies the (amount). The amount of data is indicated by the number of bytes. It includes all data available for transmission within the RLC layer, PDCP layer, and RRC layer. The size of the RLC and MAC headers is not taken into account in the buffer size calculation.
  • Power Headroom This field indicates the power headroom level.
  • the reserved bit is set to zero.
  • FIG. 7 illustrates a procedure for small data transmission in a wireless communication system to which the present invention can be applied.
  • the UE-NAS layer is a control plane service that includes small data to the UE-AS layer Delivers Control Plane Service Request (CPSR) messages.
  • CPSR Control Plane Service Request
  • Msg 1 to Msg 4 illustrated in steps 1 to 4 of FIG. 7 are the same as Msg 1 to Msg 4 of FIG. 6, detailed descriptions thereof will be omitted.
  • the UE-AS layer transmits a first message Msg 1 (that is, random access preamble) to the eNB.
  • the UE-AS layer receives a second message Msg 2 (ie, random access response) from the eNB.
  • the UE-AS layer sends a third message (Msg 3) to the eNB.
  • an RRC connection request message may be included in Msg 3 and transmitted.
  • the UE-AS layer receives a fourth message (Msg 4) from the eNB.
  • an RRC connection setup message may be included in Msg 4 and transmitted in response to the RRC connection request message.
  • the UE-AS layer Upon receiving the RRC Connection Setup message, the UE-AS layer transitions to the RRC_CONNECTED mode.
  • the UE-AS layer sends a fifth message (Msg 5) to the eNB.
  • an RRC connection setup complete message may be included in Msg 5 and transmitted.
  • UE-AS may provide Buffer Status Reporting (BSR) to Msg 5 to the eNB.
  • BSR Buffer Status Reporting
  • the base station In order to efficiently use the uplink radio resource, the base station must know what kind of data is transmitted by uplink for each user equipment. Accordingly, the terminal directly transmits information about uplink data to be transmitted by the terminal to the base station, and the base station may allocate uplink resources to the corresponding terminal based on the information. In this case, the information on the uplink data delivered to the base station by the terminal is the amount of uplink data stored in its buffer, which is called a buffer status report (BSR).
  • BSR buffer status report
  • the eNB confirms the amount of data to be transmitted by the actual UE to the uplink through the BSR, and transmits an UL grant for the PUSCH resource for the actual data transmission to the UE.
  • the UE-AS transmits actual uplink data (ie, including NAS message (eg, CPSR including small data) received from the UE-NAS) to the eNB through the PUSCH resource allocated from the eNB.
  • actual uplink data ie, including NAS message (eg, CPSR including small data) received from the UE-NAS
  • NAS message eg, CPSR including small data
  • step 5 the UE may acquire a UL grant in step 4, and in step 5, the NAS message (eg For example, a CPSR including small data may be transmitted to the eNB. In this case, the UE can reduce power consumption according to steps 6/7.
  • the NAS message eg For example, a CPSR including small data may be transmitted to the eNB. In this case, the UE can reduce power consumption according to steps 6/7.
  • DVI may correspond to the DPR MAC CE described above, or may correspond to a DV field in the DPR MAC CE.
  • FIG. 8 illustrates a procedure for data volume reporting and small data transmission in a wireless communication system to which the present invention can be applied.
  • the UE-NAS layer is a control plane service that includes small data to the UE-AS layer Delivers Control Plane Service Request (CPSR) messages.
  • CPSR Control Plane Service Request
  • Msg 1 to Msg 4 illustrated in steps 1 to 4 of FIG. 8 are the same as Msg 1 to Msg 4 of FIG. 6, the detailed description thereof will be omitted below.
  • the UE-AS layer transmits a first message Msg 1 (that is, random access preamble) to the eNB.
  • the UE-AS layer receives a second message Msg 2 (ie, random access response) from the eNB.
  • the UE-AS layer sends a third message (Msg 3) to the eNB.
  • an RRC connection request message may be included in Msg 3 and transmitted.
  • DVI may be included in Msg 3 and transmitted. DVI may be triggered when a NAS message (eg, CPSR including small data) arrives at UE-AS, and may be included in Msg 3 and transmitted.
  • NAS message eg, CPSR including small data
  • DVI may indicate the amount of user data (including SMS) and NAS signaling data volume transmitted via the user plane or control plane.
  • DVI can be reported as a single number.
  • the eNB checks the amount of data (ie, the amount of user data and data volume of NAS signaling) that the actual UE will transmit on the uplink through the DVI, and the UL grant for the PUSCH resource for the actual data transmission. To the UE.
  • amount of data ie, the amount of user data and data volume of NAS signaling
  • the UE-AS transmits actual uplink data to the eNB through a PUSCH resource allocated from the eNB.
  • the actual uplink data may include an RRC connection setup complete message for confirming successful completion of RRC connection establishment.
  • the RRC Connection Setup Complete message may include a NAS message (eg, a CPSR including small data).
  • the amount of user data (including SNS) and NAS signaling data volume to be transmitted in Msg5 may be transmitted as data volume information (ie, DVI) in MSG3.
  • data volume information ie, DVI
  • UP User Plane
  • EPIOT UP Cellular Internet of Things
  • CP Control Plane
  • data volume information ie, DVI
  • DVI data volume information
  • a message has been defined for sending data to the network via the CP. This may be referred to as a data service request message or a control plane service request message.
  • the newly defined message is transmitted to the network by the UE to carry an EPS Session Management (ESM) message in an encapsulated format.
  • ESM EPS Session Management
  • the newly defined message may also include an SMS message container for SMS transmission.
  • Table 2 illustrates the content of a data service request message or a control plane service request message.
  • IEI represents an identifier of the IE.
  • the name of the IE is used as a reference to the information element in the message.
  • the type / referece of an IE represents a section in the 3GPP TS 24.301 document that describes the IE in detail. Presence indicates whether the IE is mandatory (M), optional (O), or conditional (C).
  • format represents a format of a corresponding IE, and each format is defined in 3GPP TS 24.007.
  • length indicates the length (or range of allowed lengths) of the IE.
  • PD Protocol Discriminator
  • EMM EPS mobility management
  • Security header type IE contains information related to the security protection of NAS messages.
  • Security header type The total size of IE is 4 bits.
  • Data service request message identity IE indicates a message type.
  • the data service request message identity may be referred to as a control plane service request identity.
  • Data service type IE is used to identify the purpose of a DATA SERVICE REQUEST message.
  • the data service type IE may be referred to as a control plane service type IE.
  • the control plane service type IE is a control plane service request.
  • REQUEST is used to identify the purpose of the message.
  • the NAS key set identifier identifies a NAS key set, and the NAS key set identifier is assigned by the network.
  • ESM message container IE is included in a message when the UE wants to send an ESM message to the network.
  • the purpose of the ESM Message Container IE is to enable piggybacked transmission of a single ESM message in an EMM message.
  • the ESM message container IE may include an ESM message defined in 3GPP TS 24.301 8.3 EPS session management messages, such as a PDN connectivity request message.
  • SMS message container IE is included in the message when the UE is in EMM-IDLE mode and has a Short Message Service (SMS) message pending.
  • SMS Short Message Service
  • SMS message container IE is used to encapsulate SMS messages sent between the UE and the network.
  • the SMS Message Container IE may contain SMS messages defined in section 7.2 of 3GPP TS 24.011.
  • the IE bearer context status IE is included in the message when the UE wants to indicate the activated EPS bearer context in the UE.
  • EPS bearer context state IE is used to indicate the state of each EPS bearer context that can be identified by an EPS bearer identifier.
  • Device properties IE is included in the message when the UE sets the NAS signaling low priority.
  • CIoT Cellular Internet of Things
  • NB-IoT Low complexity terminals
  • LTE MTC Long Term Evolution
  • CIoT EPS optimization provides improved support for small data transmission.
  • CP Control Plane
  • CIoT EPS Optimization CP CIoT EPS Optimization or CIoT EPS CP Optimization
  • UP CIoT EPS User Plane
  • UP CIoT EPS Optimization or CIoT EPS
  • CP CIoT EPS optimization supports efficient delivery of user data (IP, non-IP or SMS) through a control plane via the MME without triggering data radio bearer establishment.
  • header compression of IP data may be applied to an IP PDN type PDN connection configured to support header compression.
  • the main cause of the signaling overhead corresponds to the procedure used in the current S1-based EPS architecture, which is required for UE state transitions (ie, transitions between Idle and Connected states).
  • This feature is supported based on eNB. That is, the resumption of a previously suspended connection is limited to the cell (s) established on the eNB where the connection was previously suspended.
  • this solution can be introduced and supported for UEs having transactions across multiple eNBs by introducing a cluster of eNBs that support UE context transfer between eNBs through the X2 interface.
  • the signaling overhead reduction can be realized by two new procedures described below, namely, a 'connection suspend procedure' and a 'connection resume procedure'.
  • FIG. 9 illustrates a connection suspend procedure initiated by a base station in a wireless communication system to which the present invention can be applied.
  • this procedure is used by the network to reserve the connection.
  • the eNB initiates a connection reservation procedure to the MME.
  • the eNB instructs the MME that the RRC connection of the UE will be reserved when the MME enters ECM-IDLE.
  • the eNB may include Information On Recommended Cells And eNBs For Paging in the S1 UE Context Suspend Request message. If available, the MME may store this information for use when paging the UE.
  • the eNB may include information for Enhanced Coverage (Information for Enhanced Coverage) in the S1 UE Context Suspend Request message.
  • the MME sends a Release Access Bearers Request message to the S-GW to request release of all S1-U (S1 user plane) bearers for the UE.
  • the S-GW releases eNB related information (ie, eNB address and downlink tunnel endpoint identifier (TEID) (s) for all UEs).
  • eNB related information ie, eNB address and downlink tunnel endpoint identifier (TEID) (s) for all UEs).
  • TEID downlink tunnel endpoint identifier
  • the S-GW buffers the received downlink packet for the UE and initiates a network triggered service request procedure (see 3GPP TS 23.401) triggered by the network.
  • the S-GW informs the MME of the release of the S1-U bearer in a Release Access Bearers Response message.
  • the MME sends an S1-AP UE Context Suspend Response message to the eNB to successfully terminate the connection reservation procedure initiated by the eNB.
  • the eNB sends an RRC message to the UE to reserve the RRC connection towards the UE.
  • the UE NAS When the UE NAS suspends in the EMM-IDLE state (ie, when the UE is in EMM-IDLE mode with a reservation indication), the UE must start a resume procedure to transmit uplink signaling or data.
  • FIG. 10 illustrates a connection resume procedure initiated by a UE in a wireless communication system to which the present invention can be applied.
  • this procedure is used to resume ECM-connection. Otherwise, a service request procedure (see TS 23.401) is used.
  • the UE triggers a random access procedure (see FIG. 6) to the eNB.
  • the UE triggers an RRC connection resumption procedure that includes the information needed by the eNB to access the stored AS context of the UE.
  • E-UTRAN performs a security check.
  • EPS bearer state synchronization is performed between the UE and the network. That is, the UE locally deletes the EPS bearer that is not set up for the radio bearer and is not a CP CIoT EPS bearer. If no radio bearer is established for the default EPS bearer, the UE locally deactivates all EPS bearers associated with the default EPS bearer.
  • the eNB informs the MME that the RRC connection of the UE has been resumed in the S1-AP UE Context Resume Request message including the cause of the RRC resumption. If the eNB is unable to admit all reserved bearers, the eNB indicates this in the list of rejected EPS bearers.
  • the MME enters the ECM-CONNECTED state. The MME identifies whether the UE returned to the eNB for the MME that stored the bearer context including data related to the S1AP association, UE context and DL TEID required to resume the connection.
  • the default EPS bearer is not accepted by the eNB, all EPS bearers associated with the default bearer are treated as non-accepted bearers.
  • the MME releases non-accepted bearers and non-established bearers by triggering a bearer release procedure (see TS 24.301).
  • the eNB instructs the MME the coverage level of the UE.
  • the MME acknowledges the connection resumption in the S1-AP UE Context Resume Response message. If the MME is unable to admit all reserved E-RABs, the MME indicates this in an E-RABs Failed To Resume List (IE) Information Element (IE).
  • IE Failed To Resume List
  • the eNB reconfigures the radio bearer.
  • Uplink data from the UE can now be delivered to the S-GW by the eNB.
  • the eNB transmits uplink data to the S-GW using the S-GW address and TEID stored during the connection reservation procedure.
  • the S-GW delivers uplink data to the P-GW.
  • the MME sends a Bearer Modify Request (Modify Bearer Request) message to the S-GW for each PDN connection.
  • the bearer modification request message may include an eNB address, an S1 TEID for the accepted EPS bearer, a delayed downlink packet notification request, and a RAT type.
  • the S-GW may now send downlink data to the UE.
  • the MME and S-GW are responsible for downlink data in their UE context. Clear the DL Data Buffer Expiration Time (if set).
  • the S-GW returns to the MME a bearer modification response (Modify Bearer Response) message in response to the bearer modification request (Modify Bearer Request) message.
  • the bearer response message may include an S-GW address and a TEID for uplink traffic.
  • the resume of the reserved RRC connection is higher layer (ie, NAS layer). Is initiated by.
  • the RRC layer configures the UE according to the RRC connection resumption procedure based on the stored UE AS context and any RRC settings received from the E-UTRAN.
  • the RRC connection resume procedure reactivates security and reestablishes the SRB (s) and DRB (s).
  • the resume request of the RRC connection includes a resume identifier (resumeIdentity).
  • FIG. 11 illustrates an RRC connection resumption procedure in a wireless communication system to which the present invention can be applied.
  • the UE ie, the UE AS layer
  • the E-UTRAN eg, eNB
  • the E-UTRAN eg, eNB
  • the UE NAS layer When the first NAS message occurs, the UE NAS layer pending the original NAS message, and transmits only the RRC establishment cause and call type to the UE AS layer (ie, lower layer). . As such, when the RRC establishment cause and the call type are transmitted from the NAS layer, the UE AS layer transmits an RRC connection resumption request message to the E-UTRAN.
  • the UE receives an RRC Connection Resume message for resuming the reserved RRC connection from the E-UTRAN in response to the RRC connection resumption request message (S1102a).
  • the UE Upon receiving the RRC connection resume message, the UE enters the RRC_CONNECTED state. In addition, upon receiving the RRC connection resume message, the UE AS layer instructs the higher layer (ie, the NAS layer) that the reserved RRC connection has been resumed.
  • the higher layer ie, the NAS layer
  • the UE (that is, the UE AS layer) transmits an RRC Connection Resume Complete message to the E-UTRAN in order to confirm successful completion of RRC connection resumption (S1103a).
  • the UE ie, the UE AS layer
  • the UE receives an RRC Connection Reject message for rejecting RRC connection establishment from the E-UTRAN in response to the RRC connection resumption request message (S1102a).
  • the UE AS layer Upon receiving the RRC Connection Resume message, the UE AS layer notifies the upper layer (ie, NAS layer) about the failure of the RRC connection to resume.
  • the upper layer ie, NAS layer
  • the UE NAS layer pending the original NAS message, and transmits only the RRC establishment cause and call type to the UE AS layer (ie, lower layer). .
  • the UE AS layer performs RRC connection resumption as described above in step 2 of FIG. 10 and informs the UE NAS layer of the success or failure of the resumption.
  • the UE NAS layer determines delivery to the UE AS according to the type of the first NAS message pending, and forwards to the UE AS if delivery is necessary, if not. Discard the message.
  • the suspension of NAS signaling connections may be initiated by the network in EMM-CONNECTED mode. Resumption of a reserved NAS signaling connection is initiated by the UE.
  • the UE When receiving an indication from a lower layer that an RRC connection is reserved, the UE enters an EMM-IDLE mode with suspend indication with a reservation indication but does not consider the NAS signaling connection to be released;
  • the UE When the procedure of using the initial NAS message is triggered during the EMM-IDLE mode with the reservation indication, the UE requests the lower layer to resume the RRC connection.
  • the NAS In a request to the lower layer, the NAS provides the lower layer with an RRC establishment cause and a call type;
  • the UE If the UE indicates from the lower layer that the RRC connection has been resumed during the EMM-IDLE mode with the reservation indication, the UE enters the EMM-CONNECTED mode. If the SERVICE REQUEST message is pending, the message is not sent. If the first NAS message that is different from the SERVICE REQUEST message is pending, the message is sent. If the NAS message is discarded and not transmitted to the network, the uplink NAS count value corresponding to the message is reused when the next uplink NAS message is transmitted; And
  • the UE If the UE indicates from the lower layer that the RRC connection resumption has failed during the EMM-IDLE mode with the reservation indication, the UE enters the EMM-IDLE mode without suspend indication, and any pending ( Either send the first NAS message pending or restart the ongoing NAS procedure.
  • the network enters the EMM-IDLE mode with suspend indication with the reservation indication but does not consider the NAS signaling connection to be released;
  • the network enters the EMM-CONNECTED mode.
  • FIG. 12 is a diagram illustrating a problem of a connection resumption procedure in a wireless communication system to which the present invention can be applied.
  • the CPSR with small data is triggered when the NAS layer of the UE is in an EMM-IDLE state with a suspend indication, the CPSR is pending, and the NAS layer of the UE establishes an RRC establishment cause (RRC). Only the establishment cause and call type are transmitted to the UE AS layer.
  • RRC RRC establishment cause
  • Msg 1 to Msg 4 illustrated in steps 1 to 4 of FIG. 12 are the same as Msg 1 to Msg 4 of FIG. 6, respectively, and thus detailed description thereof will be omitted.
  • the UE-AS layer transmits a first message Msg 1 (that is, random access preamble) to the eNB.
  • the UE-AS layer receives a second message Msg 2 (ie, random access response) from the eNB.
  • the UE AS layer cannot know the data volume to be sent to MSG5.
  • the MSG3 cannot be transmitted including the data volume indicator / information.
  • the UE-AS layer transmits a third message Msg 3 not including the data volume indicator / information to the eNB.
  • an RRC Connection Resume Request message may be included in Msg 3 and transmitted.
  • the UE-AS layer receives a fourth message (Msg 4) from the eNB.
  • an RRC connection setup message may be included in Msg 4 and transmitted in response to the RRC connection request message.
  • the UE-AS layer Upon receiving the RRC Connection Setup message, the UE-AS layer transitions to the RRC_CONNECTED mode.
  • the UE-AS layer sends a fifth message (Msg 5) to the eNB.
  • an RRC connection setup complete message may be included in Msg 5 and transmitted.
  • UE-AS may provide Buffer Status Reporting (BSR) to Msg 5 to the eNB.
  • BSR Buffer Status Reporting
  • the eNB confirms the amount of data to be transmitted by the actual UE to the uplink through the BSR, and transmits an UL grant for the PUSCH resource for the actual data transmission to the UE.
  • the UE-AS transmits actual uplink data (ie, including NAS message (eg, CPSR including small data) received from the UE-NAS) to the eNB through the PUSCH resource allocated from the eNB.
  • actual uplink data ie, including NAS message (eg, CPSR including small data) received from the UE-NAS
  • NAS message eg, CPSR including small data
  • the MSG3 in order to transmit a NAS message (for example, CPSR including small data) in the MSG5, the MSG3 includes a data volume indicator and transmits the data to the eNB.
  • a NAS message for example, CPSR including small data
  • the NAS layer when requesting the resumption of a reserved NAS signaling connection as described in FIG. 12 (ie, when a procedure using the original NAS message is triggered), the NAS layer sends the original NAS message to a lower layer (eg, an RRC layer). Do not forward to Therefore, since the lower layer cannot know the data volume information of the first NAS message when transmitting the Msg3, it cannot transmit to the eNB including the data volume indicator in the MSG3. As a result, since the UE has no choice but to transmit the first NAS message in MSG7, signaling overhead increases.
  • a lower layer eg, an RRC layer
  • the UE AS layer is a data volume indicator (or data volume).
  • the UE NAS layer proposes a method of delivering data volume information to the UE AS layer.
  • the NAS layer of the UE is asked to resume the RRC connection.
  • the request to resume the RRC connection may include an RRC establishment cause, a call type, and data volume information of the first NAS message pending.
  • the initial NAS message may include a data service request message used to transmit user data to the control plane.
  • the data service request message refers to a message for transmitting user data (for example, small data and SMS messages) to a data plane over a control plane. It may be referred to as a (CONTROL PLANE SERVICE REQUEST) message.
  • the data service request message may be used when the UE uses CP CIoT EPS optimization.
  • the data volume information may indicate a pure data size or may indicate the total size of a data service request message.
  • the data volume information may indicate the size of the original NAS message.
  • the pure data size described above may mean the size of a container (ie, an ESM message container or an SMS message container) containing user data, or may mean an actual user data size in the container.
  • the original NAS message includes an ATTACH REQUEST message, a DETACH REQUEST message, a TRACKING AREA UPDATE REQUEST message, a SERVICE REQUEST message, and an extended service request. SERVICE REQUEST) message.
  • the suspension of NAS signaling connections may be initiated by the network in EMM-CONNECTED mode. Resumption of a reserved NAS signaling connection is initiated by the UE.
  • the UE eg, within the NAS layer of the UE may perform the following operation.
  • the UE Upon receiving an indication from the lower layer (e.g., the RRC layer) that the RRC connection is reserved, the UE enters EMM-IDLE mode with suspend indication, but with a NAS signaling connection. May not be considered to have been released.
  • the lower layer e.g., the RRC layer
  • the indication that the RRC connection is reserved indicates that the releaseCause in the RRC Connection Release message received by the lower layer (eg, the RRC layer) of the UE indicates the RRC suspend. When, it can be delivered to the NAS layer of the UE.
  • a lower layer eg, an RRC layer
  • RRC layer may be requested to resume the RRC connection.
  • the NAS In a request to a lower layer (e.g., an RRC layer), the NAS provides the lower layer with data volume information, RRC establishment cause, and call type of the original NAS message. can do.
  • a lower layer e.g., an RRC layer
  • the UE may enter the EMM-CONNECTED mode.
  • a lower layer eg, an RRC layer
  • the indication that the RRC connection has been resumed may be delivered to the NAS layer of the UE when the lower layer (eg, RRC layer) of the UE receives an RRC Connection Resume message from the eNB.
  • the lower layer eg, RRC layer
  • the message may not be transmitted to the lower layer.
  • the message may be sent to the lower layer.
  • the uplink NAS count value corresponding to the corresponding message may be reused when the next uplink NAS message is transmitted.
  • the UE may enter the EMM-IDLE mode without the reservation indication. have.
  • the UE may transmit any pending first NAS message to the lower layer and proceed with the same procedure as when an RRC connection establishment is requested.
  • the indication that the RRC connection resumption has fallen back may be communicated to the NAS layer of the UE when the lower layer (eg, RRC layer) of the UE receives an RRC Connection Setup message from the eNB.
  • the lower layer eg, RRC layer
  • the UE AS layer may transmit an RRC Connection Resume Request message to the eNB.
  • the UE AS layer receives an RRC Connection Setup message in response to an RRC Connection Resume Request message from an eNB, the UE AS layer indicates an indication that the RRC connection resume has fallen back. Can be sent to.
  • the UE Upon receiving an indication from the lower layer (e.g., the RRC layer) that an RRC connection resumption has failed and an indication that the RRC connection is reserved, the UE sends an EMM-IDLE mode with suspend indication. You can enter and restart the NAS procedure in progress (if requested).
  • the lower layer e.g., the RRC layer
  • the UE Upon receiving an indication from the lower layer (e.g., the RRC layer) that an RRC connection resumption has failed and an indication that the RRC connection is not reserved, the UE sends an EMM-IDLE mode without suspend indication. You can enter and restart the NAS procedure in progress (if requested).
  • the lower layer e.g., the RRC layer
  • the indication that the RRC connection resumption has failed may be delivered to the NAS layer of the UE when the lower layer of the UE (eg, the RRC layer) receives an RRC Connection Reject message from the eNB.
  • the network eg, NAS layer of the network (eg, MME)
  • MME Mobility Management Entity
  • the network may enter the EMM-IDLE mode with suspend indication accompanied by the reservation indication, but may not consider the NAS signaling connection to be released.
  • the network may enter the EMM-CONNECTED mode.
  • the operation of transmitting the data volume indicator / information (or reporting the data volume and the power headroom) from the NAS layer described above to the lower layer (ie, the AS layer, for example, the RRC layer) is NB-IoT RAT (Or NB-S1 mode). And, it may not be applied to the E-UTRAN RAT (or WB-S1 mode).
  • the lower layer ie, AS layer, e.g.
  • AS layer e.g. The operation of transmitting the data volume indicator to the RRC layer.
  • it may not be applied when the UE is served from the E-UTRAN RAT (or when the UE is in WB-S1 mode).
  • the reason for limiting only to NB-IoT RAT is because of NB-IoT UE (ie, UE or NB-S1 (or NB-IoT) connected to NB-IoT RAT). This is because power saving of the UE is more important. Therefore, the NB-IoT terminal reduces the number of transmission Msg, and also the operation of quickly completing the Msg transmission and entering the EMM-IDLE (or RRC-IDLE) is compared with that of the E-UTRAN (i.e., the UE to which the WB-S1 mode is applied). This is because it has a greater impact to reduce power of the UE.
  • the NAS layer of the UE may provide data volume information of the first NAS message pending to the AS layer of the UE regardless of the serving RAT (or mode of the UE) of the UE.
  • the AS layer of the UE can be used only in the NB-IoT RAT (or NB-S1 (or NB-IoT) mode). In this case, the method according to the first embodiment described above may be used.
  • the data volume information of the first NAS message pending is sent to the UE-AS to the UE-AS only if it is in the NB-IoT RAT (or NB-S1 (or NB-IoT) mode). Can be provided to the layer.
  • the method according to the second embodiment described below may be used.
  • the suspension of NAS signaling connections may be initiated by the network in EMM-CONNECTED mode. Resumption of a reserved NAS signaling connection is initiated by the UE.
  • the UE eg, within the NAS layer of the UE may perform the following operation.
  • the UE Upon receiving an indication from the lower layer (e.g., the RRC layer) that the RRC connection is reserved, the UE enters EMM-IDLE mode with suspend indication, but with a NAS signaling connection. May not be considered to have been released.
  • the lower layer e.g., the RRC layer
  • the indication that the RRC connection is reserved indicates that the releaseCause in the RRC Connection Release message received by the lower layer (eg, the RRC layer) of the UE indicates the RRC suspend. When, it can be delivered to the NAS layer of the UE.
  • a lower layer eg, an RRC layer
  • RRC layer may be requested to resume the RRC connection.
  • the NAS may provide the lower layer with an RRC establishment cause and a call type.
  • the NAS layer of the UE may additionally provide data volume information of the initial NAS message to the lower layer (eg, the RRC layer).
  • the UE may enter the EMM-CONNECTED mode.
  • a lower layer eg, an RRC layer
  • the indication that the RRC connection has been resumed may be delivered to the NAS layer of the UE when the lower layer (eg, RRC layer) of the UE receives an RRC Connection Resume message from the eNB.
  • the lower layer eg, RRC layer
  • the message may not be transmitted to the lower layer.
  • the message may be sent to the lower layer.
  • the uplink NAS count value corresponding to the corresponding message may be reused when the next uplink NAS message is transmitted.
  • the UE may enter the EMM-IDLE mode without the reservation indication. have.
  • the UE may transmit any pending first NAS message to the lower layer and proceed with the same procedure as when an RRC connection establishment is requested.
  • the indication that the RRC connection resumption has fallen back may be communicated to the NAS layer of the UE when the lower layer (eg, RRC layer) of the UE receives an RRC Connection Setup message from the eNB.
  • the lower layer eg, RRC layer
  • the UE AS layer may transmit an RRC Connection Resume Request message to the eNB.
  • the UE AS layer receives an RRC Connection Setup message in response to an RRC Connection Resume Request message from an eNB, the UE AS layer indicates an indication that the RRC connection resume has fallen back. Can be sent to.
  • the UE Upon receiving an indication from the lower layer (e.g., the RRC layer) that an RRC connection resumption has failed and an indication that the RRC connection is reserved, the UE sends an EMM-IDLE mode with suspend indication. You can enter and restart the NAS procedure in progress (if requested).
  • the lower layer e.g., the RRC layer
  • the UE Upon receiving an indication from the lower layer (e.g., the RRC layer) that an RRC connection resumption has failed and an indication that the RRC connection is not reserved, the UE sends an EMM-IDLE mode without suspend indication. You can enter and restart the NAS procedure in progress (if requested).
  • the lower layer e.g., the RRC layer
  • the indication that the RRC connection resumption has failed may be delivered to the NAS layer of the UE when the lower layer of the UE (eg, the RRC layer) receives an RRC Connection Reject message from the eNB.
  • the network eg, NAS layer of the network (eg, MME)
  • MME Mobility Management Entity
  • the network may enter the EMM-IDLE mode with suspend indication accompanied by the reservation indication, but may not consider the NAS signaling connection to be released.
  • the network may enter the EMM-CONNECTED mode.
  • FIG. 13 is a diagram illustrating a method in which a UE performs NAS signaling reservation / resume according to an embodiment of the present invention.
  • a higher layer of the UE may be a NAS layer, and a lower layer may be an AS layer (eg, an RRC layer).
  • the higher layer of the UE receives an indication that the RRC connection is reserved from the lower layer (S1301), the higher layer of the UE is in the EMM-IDLE mode with the suspension indication. Enter (S1302).
  • the request for resumption of the RRC connection may include an RRC establishment cause and a call type.
  • the request for resuming the RRC connection may further include data volume information of the initial NAS message.
  • the original NAS message may include a first message (eg, a data service request message or a control plane service request message) for transmitting data to the control plane.
  • a first message eg, a data service request message or a control plane service request message
  • data volume information may indicate the size of data or the size of the first message.
  • the data volume information may indicate the size of the ESM message container including the EPS Session Management (ESM) message in the first message or the size of the SMS message container including the Short Message Service (SMS) message.
  • ESM EPS Session Management
  • SMS Short Message Service
  • the UE when the UE is in the EMM-IDLE mode with a suspend indication, when the UE receives an indication that the RRC connection has been resumed from a lower layer, the UE may enter the EMM-CONNECTED mode. .
  • the first NAS message is a SERVICE REQUEST message
  • the first NAS message is not delivered to the lower layer, but if the first NAS message is not a SERVICE REQUEST message, the first NAS message is It may be delivered to a lower layer.
  • EMM-IDLE mode when the UE is in the EMM-IDLE mode with a suspend indication, when the UE receives an indication from the lower layer that the resumption of the RRC connection has fallen back, the UE is suspended. EMM-IDLE mode can be entered.
  • the first NAS message may be delivered to a lower layer.
  • the UE when the UE receives the indication that the resumption of the RRC connection has failed from the lower layer where the RRC connection is reserved when the UE is in the EMM-IDLE mode with the suspend indication, the UE suspends. You can enter EMM-IDLE mode with an indication.
  • the UE when the UE is in the EMM-IDLE mode with a suspend indication, if the UE receives an indication that the resumption of the RRC connection has failed from a lower layer in which the RRC connection is not reserved, the UE suspends. ) You can enter the EMM-IDLE mode without instructions.
  • FIG. 14 illustrates a block diagram of a communication device according to an embodiment of the present invention.
  • a wireless communication system includes a network node 1410 and a plurality of terminals (UEs) 1420.
  • UEs terminals
  • the network node 1410 includes a processor 1411, a memory 1412, and a communication module 1413.
  • the processor 1411 implements the functions, processes, and / or methods proposed in FIGS. 1 to 13. Layers of the wired / wireless interface protocol may be implemented by the processor 1411.
  • the memory 1412 is connected to the processor 1411 and stores various information for driving the processor 1411.
  • the communication module 1413 is connected to the processor 1411 to transmit and / or receive wired / wireless signals.
  • a base station an MME, an HSS, an SGW, a PGW, an SCEF, or an SCS / AS may correspond thereto.
  • the communication module 1413 may include a radio frequency unit (RF) unit for transmitting / receiving a radio signal.
  • RF radio frequency unit
  • the terminal 1420 includes a processor 1421, a memory 1422, and a communication module (or RF unit) 1423.
  • the processor 1421 implements the functions, processes, and / or methods proposed in FIGS. 1 to 13. Layers of the air interface protocol may be implemented by the processor 1421. In particular, the processor may include a NAS layer and an AS layer.
  • the memory 1422 is connected to the processor 1421 and stores various information for driving the processor 1421.
  • the communication module 1423 is connected with the processor 1421 to transmit and / or receive a radio signal.
  • the memories 1412 and 1422 may be inside or outside the processors 1411 and 1421, and may be connected to the processors 1411 and 1421 through various well-known means.
  • the network node 1410 if the base station
  • the terminal 1420 may have a single antenna (multiple antenna) or multiple antenna (multiple antenna).
  • FIG. 15 illustrates a block diagram of a communication device according to an embodiment of the present invention.
  • FIG. 26 is a diagram illustrating the terminal of FIG. 14 in more detail.
  • the terminal may include a processor (or a digital signal processor (DSP) 1510, an RF module (or RF unit) 1535, and a power management module 1505). ), Antenna 1540, battery 1555, display 1515, keypad 1520, memory 1530, SIM card Subscriber Identification Module card) 1525 (this configuration is optional), speaker 1545, and microphone 1550.
  • the terminal may also include a single antenna or multiple antennas. Can be.
  • the processor 1510 implements the functions, processes, and / or methods proposed in FIGS. 1 to 13.
  • the layer of the air interface protocol may be implemented by the processor 1510.
  • the memory 1530 is connected to the processor 1510 and stores information related to the operation of the processor 1510.
  • the memory 1530 may be inside or outside the processor 1510 and may be connected to the processor 1510 by various well-known means.
  • the processor 1510 receives the command information, processes the telephone number, and performs a proper function. Operational data may be extracted from the SIM card 1525 or the memory 1530. In addition, the processor 1510 may display command information or driving information on the display 1515 for the user to recognize and for convenience.
  • the RF module 1535 is connected to the processor 1510 to transmit and / or receive an RF signal.
  • the processor 1510 transmits command information to the RF module 1535 to transmit a radio signal constituting voice communication data, for example, to initiate communication.
  • the RF module 1535 is composed of a receiver and a transmitter for receiving and transmitting a radio signal.
  • the antenna 1540 functions to transmit and receive wireless signals. Upon receiving the wireless signal, the RF module 1535 may forward the signal and convert the signal to baseband for processing by the processor 1510. The processed signal may be converted into audible or readable information output through the speaker 1545.
  • each component or feature is to be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
  • the software code may be stored in memory and driven by the processor.
  • the memory may be located inside or outside the processor, and may exchange data with the processor by various known means.

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Abstract

L'invention concerne un procédé et un appareil d'interruption/reprise de signalisation NAS dans un système de communication sans fil. Plus particulièrement, l'invention concerne un procédé pour un équipement utilisateur (UE) pour interrompre/reprendre une connexion de signalisation de strate hors accès (NAS) dans un système de communication sans fil comprenant : une étape dans laquelle, lors de la réception par une couche NAS de l'UE, en provenance d'une couche de contrôle des ressources radioélectriques (RRC), d'une indication selon laquelle la connexion RRC est interrompue, l'UE entre dans un mode de repos de gestion de mobilité (EMM) de système évolué en mode paquet (EPS) impliquant une indication d'interruption; et une étape dans laquelle, lors du déclenchement d'une procédure utilisant un premier message NAS, il est demandé à la couche RRC de l'UE est de reprendre la connexion RRC, la demande comprenant une cause d'un établissement RC et un type d'appel, et lorsque l'UE se trouve dans un mode de bande étroite (NB)-S1, la demande peut en outre comprendre des informations de volume de données du premier message NAS.
PCT/KR2017/004504 2016-04-28 2017-04-27 Procédé et appareil d'interruption/reprise de signalisation nas dans un système de communication sans fil Ceased WO2017188758A1 (fr)

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